Beamlet migration based on local perturbation theory

Beamlet migration based on local perturbation theory is proposed. The method is formulated with a local bac kground velocity and local perturbations for each window of the wave eld decomposition using GaborDaubechies frame and local cosine basis. The propagators and phase-correction operators are obtained analytically for the G-D tight-frame, and numerically for the local cosine basis. The numerical test using the SEG-EAEG salt model poststac kdata demonstrates the great potential of this approach.